diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs b/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs
deleted file mode 100644
index 80ee87f..0000000
--- a/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs
+++ /dev/null
@@ -1,28 +0,0 @@
-using JetBrains.Annotations;
-using UnityEngine.Networking;
-
-namespace YooAsset
-{
-    public delegate UnityWebRequest DownloadRequestDelegate(string url);
-
-    /// <summary>
-    /// 自定义下载器的请求
-    /// </summary>
-    internal static class DownloadRequestUtil
-    {
-        
-        [CanBeNull] private static DownloadRequestDelegate _downloadRequestDelegate;
-
-        public static void SetRequestDelegate(DownloadRequestDelegate requestDelegate)
-        {
-            _downloadRequestDelegate = requestDelegate;
-        }
-
-        public static UnityWebRequest NewRequest(string requestURL)
-        {
-            return _downloadRequestDelegate != null
-                ? _downloadRequestDelegate?.Invoke(requestURL)
-                : new UnityWebRequest(requestURL, UnityWebRequest.kHttpVerbGET);
-        }
-    }
-}
\ No newline at end of file
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs.meta b/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs.meta
deleted file mode 100644
index 9b07fd2..0000000
--- a/Assets/YooAsset/Runtime/DownloadSystem/DownloadRequestDelegate.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 3b21da9f048045e2af56d9d396b11c2f
-timeCreated: 1677207036
\ No newline at end of file
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs b/Assets/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs
index 88514d1..32da42d 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs
@@ -6,6 +6,11 @@ using UnityEngine.Networking;
 
 namespace YooAsset
 {
+	/// <summary>
+	/// 自定义下载器的请求委托
+	/// </summary>
+	public delegate UnityWebRequest DownloadRequestDelegate(string url);
+
 	/// <summary>
 	/// 1. 保证每一时刻资源文件只存在一个下载器
 	/// 2. 保证下载器下载完成后立刻验证并缓存
@@ -17,10 +22,15 @@ namespace YooAsset
 		private static readonly List<string> _removeList = new List<string>(100);
 
 
+		/// <summary>
+		/// 自定义下载器的请求委托
+		/// </summary>
+		public static DownloadRequestDelegate RequestDelegate = null;
+
 		/// <summary>
 		/// 自定义的证书认证实例
 		/// </summary>
-		public static CertificateHandler CertificateHandlerInstance;
+		public static CertificateHandler CertificateHandlerInstance = null;
 
 		/// <summary>
 		/// 启用断点续传功能文件的最小字节数
@@ -32,14 +42,6 @@ namespace YooAsset
 		/// </summary>
 		public static List<long> ClearFileResponseCodes { set; get; }
 
-		/// <summary>
-		/// 自定义下载请求
-		/// </summary>
-		/// <param name="requestDelegate"></param>
-		public static void SetRequestDelegate(DownloadRequestDelegate requestDelegate)
-		{
-			DownloadRequestUtil.SetRequestDelegate(requestDelegate);
-		}
 
 		/// <summary>
 		/// 更新所有下载器
@@ -75,7 +77,11 @@ namespace YooAsset
 			}
 			_downloaderDic.Clear();
 			_removeList.Clear();
+			
+			RequestDelegate = null;
+			CertificateHandlerInstance = null;
 			BreakpointResumeFileSize = int.MaxValue;
+			ClearFileResponseCodes.Clear();
 		}
 
 
@@ -110,6 +116,18 @@ namespace YooAsset
 			}
 		}
 
+		/// <summary>
+		/// 创建一个新的网络请求
+		/// </summary>
+		public static UnityWebRequest NewRequest(string requestURL)
+		{
+			if (RequestDelegate != null)
+				return RequestDelegate.Invoke(requestURL);
+
+			var request = new UnityWebRequest(requestURL, UnityWebRequest.kHttpVerbGET);
+			return request;
+		}
+
 		/// <summary>
 		/// 获取下载器的总数
 		/// </summary>
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/Downloader/FileDownloader.cs b/Assets/YooAsset/Runtime/DownloadSystem/Downloader/FileDownloader.cs
index ad3d686..5576674 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/Downloader/FileDownloader.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/Downloader/FileDownloader.cs
@@ -80,7 +80,7 @@ namespace YooAsset
 				if (File.Exists(_tempFilePath))
 					File.Delete(_tempFilePath);
 
-				_webRequest = DownloadRequestUtil.NewRequest(_requestURL);
+				_webRequest = DownloadSystem.NewRequest(_requestURL);
 				DownloadHandlerFile handler = new DownloadHandlerFile(_tempFilePath);
 				handler.removeFileOnAbort = true;
 				_webRequest.downloadHandler = handler;
@@ -109,11 +109,11 @@ namespace YooAsset
 				}
 
 #if UNITY_2019_4_OR_NEWER
-				_webRequest = DownloadRequestUtil.NewRequest(_requestURL);
+				_webRequest = DownloadSystem.NewRequest(_requestURL);
 				var handler = new DownloadHandlerFile(_tempFilePath, true);
 				handler.removeFileOnAbort = false;
 #else
-				_webRequest = UnityWebRequestUtil.NewRequest(_requestURL);
+				_webRequest = DownloadSystem.NewRequest(_requestURL);
 				var handler = new DownloadHandlerFileRange(_tempFilePath, _bundleInfo.Bundle.FileSize, _webRequest);
 				_downloadHandle = handler;
 #endif
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/UnityWebDataRequester.cs b/Assets/YooAsset/Runtime/DownloadSystem/UnityWebDataRequester.cs
index 31ad283..6c0a213 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/UnityWebDataRequester.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/UnityWebDataRequester.cs
@@ -29,7 +29,7 @@ namespace YooAsset
 			if (_webRequest == null)
 			{
 				URL = url;
-				_webRequest = DownloadRequestUtil.NewRequest(URL);
+				_webRequest = DownloadSystem.NewRequest(URL);
 				DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
 				_webRequest.downloadHandler = handler;
 				_webRequest.disposeDownloadHandlerOnDispose = true;
diff --git a/Assets/YooAsset/Runtime/DownloadSystem/UnityWebFileRequester.cs b/Assets/YooAsset/Runtime/DownloadSystem/UnityWebFileRequester.cs
index ba2d73b..f5c08bc 100644
--- a/Assets/YooAsset/Runtime/DownloadSystem/UnityWebFileRequester.cs
+++ b/Assets/YooAsset/Runtime/DownloadSystem/UnityWebFileRequester.cs
@@ -39,7 +39,7 @@ namespace YooAsset
 				_latestDownloadBytes = 0;
 				_latestDownloadRealtime = Time.realtimeSinceStartup;
 
-				_webRequest = DownloadRequestUtil.NewRequest(URL);
+				_webRequest = DownloadSystem.NewRequest(URL);
 				DownloadHandlerFile handler = new DownloadHandlerFile(savePath);
 				handler.removeFileOnAbort = true;
 				_webRequest.downloadHandler = handler;
diff --git a/Assets/YooAsset/Runtime/YooAssets.cs b/Assets/YooAsset/Runtime/YooAssets.cs
index 6e62354..466be01 100644
--- a/Assets/YooAsset/Runtime/YooAssets.cs
+++ b/Assets/YooAsset/Runtime/YooAssets.cs
@@ -168,15 +168,6 @@ namespace YooAsset
 			DownloadSystem.BreakpointResumeFileSize = fileBytes;
 		}
 
-		/// <summary>
-		/// 自定义下载请求
-		/// </summary>
-		/// <param name="requestDelegate"></param>
-		public static void SetDownloadSystemUnityWebRequest(DownloadRequestDelegate requestDelegate)
-		{
-			DownloadSystem.SetRequestDelegate(requestDelegate);
-		}
-
 		/// <summary>
 		/// 设置下载系统参数，下载失败后清理文件的HTTP错误码
 		/// </summary>
@@ -193,6 +184,14 @@ namespace YooAsset
 			DownloadSystem.CertificateHandlerInstance = instance;
 		}
 
+		/// <summary>
+		/// 设置下载系统参数，自定义下载请求
+		/// </summary>
+		public static void SetDownloadSystemUnityWebRequest(DownloadRequestDelegate requestDelegate)
+		{
+			DownloadSystem.RequestDelegate = requestDelegate;
+		}
+
 		/// <summary>
 		/// 设置异步系统参数，每帧执行消耗的最大时间切片（单位：毫秒）
 		/// </summary>